Karkheh


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Karkheh

(kär`kĕ), ancient Choaspes, river, c.350 mi (560 km) long, rising in the Zagros Mts., W Iran, and flowing S into the Khuzestan lowland, where it forms a swamp bordering the Tigris River. An ancient storage dam on the river at Shush made Khuzestan one of the most prosperous agricultural regions of SW Asia until the system fell into disrepair and the irrigated area reverted to desert. The area has been reclaimed as part of the Khuzestan project.

Karkheh

 

a river in Iran whose lower course crosses into Iraq. It is 870 km long and drains an area of about 50,000 sq km. The river rises in the Zagros Mountains and, in its upper and middle course, flows mostly along the bottoms of deep gorges and sometimes through canyons. In its lower course the Karkheh flows through the Khuzistan Lowland, where it branches and disappears in the swamps of El Hawiza. During high-water periods it empties into the Tigris. High-water occurs during the spring when the snow has melted in the mountains, and there are summer floods caused by rain; the lowest water level occurs during autumn and winter. The average discharge in the lower course is about 220 cu m per sec. More than 100,000 hectares are irrigated in the Karkheh basin.

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Terming the situation as critical, he said despite the fears of renewed flooding the floodgates at the Karkheh dam were opened to ease build-up.
"At present, the water input to the Karkheh dam is 2,287 cubic meters per second, and the water output from this dam is 2,400 cubic meters per second," noted Lashkari.
studies, the terminal ponds of the fish way constructed in the Karkheh diversion dam are not submerged during low water seasons, and the fish way do not have the required functioning.
Evaluation of performance of plastic concrete cutoff wallin Karkheh Dam using 3-D seepage analysis and actual measurement, Journal of Applied Sciences, 40: 30-35
Hosseini and Aghabeigi identified the relationships between discharge and flood using Karkheh watershed data in Paypel station and suggested a multivariate nonlinear method in order to estimate maximum momentary discharge and mean annual peak [4].
In Iran this fish is reported in the Karun and Karkheh rivers (Nikpei 1996), and Hurol'azim and Shadegan lagoons (Najafpur 1996).
Understanding hydrological variability for improved water management in the semi-arid Karkheh Basin, Iran.
This is while, basins at south of Iran, especially Karkheh show significant growth in operation from surface water resources the reason of which lies in the development of related infrastructures.
"Currently we're exporting 750-800MW - with the construction of the 400KW Karkheh Al-Amarah power line, the amount of electricity exported to Iraq will climb to over 1GW", Behzad told IRINN.
According to a survey conducted by the Iraqi Ministry of Water Resources, nearly 42 small rivers and lakes been cut off by water or their courses reverted into Iranian territory, particularly the Karun and Karkheh rivers and Alwand.
BASRA / Aswat al-Iraq: Iraqi Vice President Tareq al-Hashemi said on Saturday from Basra province that Iran should prove its friendship to Iraq by allowing more water to enter Iraqi territories through the two rivers of Karun and Karkheh.
The pipeline will run from the Karkheh dam in Iran, with a marine section to be built under the northern Gulf, to Kuwait's Bubiyan island.